Full moon with 22-degree lunar halo, Joshua Tree National Park. The lunar halo (not to be cofused with lunar corona) forms when moonlight refracts through high altitude ice crystals. As no light is refracted at angles smaller than 22-degrees the sky is darker inside the halo.
Image ID: 30711
Location: Joshua Tree National Park, California, USA

Star Trails over the San Diego Downtown City Skyline. In this 60 minute exposure, stars create trails through the night sky over downtown San Diego.
Image ID: 28383
Location: San Diego, California, USA

Milky Way during Full Lunar Eclipse over Arch Rock, Joshua Tree National Park, April 4 2015. The arch and surrounding landscape are illuminated by the faint light of the fully-eclipsed blood red moon. Light from the sun has passed obliquely through the Earth's thin atmosphere, taking on a red color, and is then reflected off the moon and reaches the Earth again to light the arch. The intensity of this light is so faint that the Milky Way can be seen clearly at the same time.
Image ID: 30717
Location: Joshua Tree National Park, California, USA
Pano dimensions: 8903 x 14184

Radio telescope antenna, part of the Very Long Baseline Array (VLBA). The Very Long Baseline Array (VLBA) is a system of ten radio telescopes which are operated remotely from their Array Operations Center located in Socorro, New Mexico, as a part of the National Radio Astronomy Observatory (NRAO). These ten radio antennas work together as an array that forms the longest system in the world that uses very long baseline interferometry.
Image ID: 28787
Location: Big Pine, California, USA

Lunar eclipse sequence. While the moon lies in the full shadow of the earth (umbra) it receives only faint, red-tinged light refracted through the Earth's atmosphere. As the moon passes into the penumbra it receives increasing amounts of direct sunlight, eventually leaving the shadow of the Earth altogether. October 8, 2014.
Image ID: 29411
Pano dimensions: 8000 x 8000

Full Moon Rising over Hotel del Coronado, known affectionately as the Hotel Del. It was once the largest hotel in the world, and is one of the few remaining wooden Victorian beach resorts. It sits on the beach on Coronado Island, seen here with downtown San Diego in the distance. It is widely considered to be one of Americas most beautiful and classic hotels. Built in 1888, it was designated a National Historic Landmark in 1977.
Image ID: 29420
Location: San Diego, California, USA

Delicate Arch and the Moon at Sunset. The moon and clouds, with stars showing faintly in the sky, as sunset fades into night.
Image ID: 27859
Location: Arches National Park, Utah, USA

Scripps Institution of Oceanography Research Pier at night, lit with stars in the sky, old La Jolla town in the distance.
Image ID: 28451
Location: Scripps Institution of Oceanography, La Jolla, California, USA